U.S. & World

Day had undergone emergency surgery after being rushed to Northwestern Memorial Hospital after getting viciously knocked out in the 10th round by Charles Conwell on Saturday.

Fighting at super welterweight on the undercard of Oleksandr Usyk's heavyweight debut against Chazz Witherspoon, Conwell landed a right hand early in the 10th. That caused Day (17-4-1, 6 knockouts) to stumble and seconds later Conwell landed a left hook that knocked Day to the canvas.

The 27-year-old Day, from Freeport, New York, was instantly knocked out and it wasn't clear if he regained consciousness. He was treated by a doctor in the ring and then was rushed off on a stretcher by paramedics and transported to the hospital. Day was knocked down twice earlier in the fight.

Day had lapsed into a coma after suffering the injury and never regained consciousness.

Eddie Hearn, the managing director of the promoter, Matchroom Sport, said after the bout that Day never gave up in the bout.

Hearn said: "I think there was 30 seconds left in the final round and he was still trying to win the fight and he was a mile behind in the fight and he could've easily not tried to win the fight, but he got knocked out trying to win the fight. "